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This is a patch that implements a generic hooking API for the generic ACPI battery driver. With this new generic API, drivers can expose platform specific behaviour via sysfs attributes in /sys/class/power_supply/BATn/ in a generic way. A perfect example of the need for this API are Lenovo ThinkPads. Lenovo ThinkPads have a ACPI extension that allows the setting of start and stop charge thresholds in the EC and battery firmware via ACPI. The thinkpad_acpi module can use this API to expose sysfs attributes that it controls inside the ACPI battery driver sysfs tree, under /sys/class/power_supply/BATN/. The file drivers/acpi/battery.h has been moved to include/acpi/battery.h and the includes inside ac.c, sbs.c, and battery.c have been adjusted to reflect that. When drivers hooks into the API, the API calls add_battery() for each battery in the system that passes it a acpi_battery struct. Then, the drivers can use device_create_file() to create new sysfs attributes with that struct and identify the batteries for per-battery attributes. Signed-off-by: Ognjen Galic <smclt30p@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
21 lines
561 B
C
21 lines
561 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ACPI_BATTERY_H
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#define __ACPI_BATTERY_H
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#define ACPI_BATTERY_CLASS "battery"
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#define ACPI_BATTERY_NOTIFY_STATUS 0x80
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#define ACPI_BATTERY_NOTIFY_INFO 0x81
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#define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
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struct acpi_battery_hook {
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const char *name;
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int (*add_battery)(struct power_supply *battery);
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int (*remove_battery)(struct power_supply *battery);
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struct list_head list;
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};
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void battery_hook_register(struct acpi_battery_hook *hook);
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void battery_hook_unregister(struct acpi_battery_hook *hook);
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#endif
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